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The Bulge-Disk Orthogonal Decoupling in Galaxies: NGC 4698 and NGC 4672

from Part 5 - Bulge Phenomenology

Published online by Cambridge University Press:  10 November 2010

By
F. Bertola ,
E.M. Corsini ,
M. Cappellari ,
J.C. Vega Beltrán ,
A. Pizzella ,
M. Sarzi  and
J.G. Funes
Edited by
C. Marcella Carollo ,
Henry C. Ferguson  and
Rosemary F. G. Wyse
F. Bertola
Affiliation:
Dipartimento di Astronomià, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
E.M. Corsini
Affiliation:
Dipartimento di Astronomià, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
M. Cappellari
Affiliation:
Dipartimento di Astronomià, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
J.C. Vega Beltrán
Affiliation:
Telescopio Nazionale Galileo, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
A. Pizzella
Affiliation:
European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago 10, Chile
M. Sarzi
Affiliation:
Dipartimento di Astronomià, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
J.G. Funes
Affiliation:
Dipartimento di Astronomià, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
C. Marcella Carollo
Affiliation:
Columbia University, New York
Henry C. Ferguson
Affiliation:
Space Telescope Science Institute, Baltimore
Rosemary F. G. Wyse
Affiliation:
The Johns Hopkins University
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Summary

We report the case of the geometrical and kinematical decoupling between the bulge and the disk of the Sa galaxy NGC 4698. The R–band isophotal map of this spiral shows that the bulge structure is elongated perpendicularly to the major axis of the disk. At the same time a central stellar velocity gradient is found along the major axis of the bulge. We also present the Sa galaxy NGC 4672 as being a good candidate for a spiral hosting a bulge and a disk that are orthogonally decoupled with respect to one other. This decoupling of the two fundamental stellar components suggests that the disk could represent a second event in the history of early-type spirals.

Introduction

NGC 4698 is classified Sa by Sandage & Tammann (1981) and Sab(s) by de Vaucouleurs et al. (1991; RC3). Sandage & Bedke (1994; CAG) present NGC 4698 as an example of the early-to-intermediate Sa type since it is characterized by a large central bulge and tightly wound spiral arms. In addition to a remarkable geometrical decoupling between the bulge and the disk (whose apparent major axes appear oriented in an orthogonal way upon simple visual inspection of galaxy plates; see Panels 78, 79 and 87 in CAG), a spectrum taken along the minor axis of the disk shows the presence of a stellar velocity gradient which could be ascribed to the bulge.

Type
Chapter
Information
The Formation of Galactic Bulges , pp. 165 - 169
Publisher: Cambridge University Press
Print publication year: 2000

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  • The Bulge-Disk Orthogonal Decoupling in Galaxies: NGC 4698 and NGC 4672
    • By F. Bertola, Dipartimento di Astronomià, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, E.M. Corsini, Dipartimento di Astronomià, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, M. Cappellari, Dipartimento di Astronomià, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, J.C. Vega Beltrán, Telescopio Nazionale Galileo, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, A. Pizzella, European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago 10, Chile, M. Sarzi, Dipartimento di Astronomià, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, J.G. Funes, Dipartimento di Astronomià, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
  • Edited by C. Marcella Carollo, Columbia University, New York, Henry C. Ferguson, Space Telescope Science Institute, Baltimore, Rosemary F. G. Wyse, The Johns Hopkins University
  • Book: The Formation of Galactic Bulges
  • Online publication: 10 November 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511564611.027
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  • The Bulge-Disk Orthogonal Decoupling in Galaxies: NGC 4698 and NGC 4672
    • By F. Bertola, Dipartimento di Astronomià, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, E.M. Corsini, Dipartimento di Astronomià, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, M. Cappellari, Dipartimento di Astronomià, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, J.C. Vega Beltrán, Telescopio Nazionale Galileo, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, A. Pizzella, European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago 10, Chile, M. Sarzi, Dipartimento di Astronomià, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, J.G. Funes, Dipartimento di Astronomià, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
  • Edited by C. Marcella Carollo, Columbia University, New York, Henry C. Ferguson, Space Telescope Science Institute, Baltimore, Rosemary F. G. Wyse, The Johns Hopkins University
  • Book: The Formation of Galactic Bulges
  • Online publication: 10 November 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511564611.027
Available formats
×

Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • The Bulge-Disk Orthogonal Decoupling in Galaxies: NGC 4698 and NGC 4672
    • By F. Bertola, Dipartimento di Astronomià, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, E.M. Corsini, Dipartimento di Astronomià, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, M. Cappellari, Dipartimento di Astronomià, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, J.C. Vega Beltrán, Telescopio Nazionale Galileo, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, A. Pizzella, European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago 10, Chile, M. Sarzi, Dipartimento di Astronomià, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy, J.G. Funes, Dipartimento di Astronomià, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
  • Edited by C. Marcella Carollo, Columbia University, New York, Henry C. Ferguson, Space Telescope Science Institute, Baltimore, Rosemary F. G. Wyse, The Johns Hopkins University
  • Book: The Formation of Galactic Bulges
  • Online publication: 10 November 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511564611.027
Available formats
×